package com.atguigu.gulimall.product.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

//    @Autowired
//    CategoryDao categoryDao;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {

        //1.查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
         //去查处所有的一级分类
        List<CategoryEntity> firstLevel = entities.stream().filter(item ->
            item.getParentCid() == 0
        ).map(menu ->{
            menu.setChildren(getChildren(menu, entities));
            return  menu;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null? 0: menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());

        //组装成父子分类

        return firstLevel;
    }

    @Override
    public void removeMenusById(List<Long> longs) {
        //TODO 检查当前删除的菜单，是否被别的地方应用

        // 逻辑删除


        // 物理删除
        baseMapper.deleteBatchIds(longs);

    }

    /**
     * 获取某一个菜单的子菜单
     * @param  当前菜单，
     * @param  菜单的集合
     *
     */

    private List<CategoryEntity> getChildren( CategoryEntity root,List<CategoryEntity> all){

        //过滤,通过递归找到子菜单
        List<CategoryEntity> collect = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity->{
            // 1. 找到子菜单
            categoryEntity.setChildren(getChildren(categoryEntity,all ));
            return  categoryEntity;
        }).sorted((menu1,menu2)->{
            // 2.对菜单进行排序
            return (menu1.getSort()==null? 0: menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return collect;
    }

}